I'm no BLM expert by any means, but if one were to pursue the ground effect idea perhaps it could be used to place a damage-down debuff on enemies standing within its effective area. This could give BLM some much-needed utility, as not only would this be helpful against tankbusters in trials/raids, but also it can help a lot during some of the more troublesome trash pulls in dungeons too. This could also set it apart from SMN's/SCH's Shadowflare and NIN's Doton effects. I feel that this would be more beneficial than the Bind effect, which doesn't bother a great deal of enemies much to begin with. I don't know if this is a good idea or not, but it's an idea at least.